exam Maths Puzzle Numerical Ability

(3x-2y)^2=
a. 9x^2-4y^2
b. 9X^2+4y^2
c. 9x^2+4y^2-6xy
d. 9x^2+4y^2-12xy

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(-(-1+h)^3-(-1)^3)/h what is the slope for x= -8